Hydraulic remote control apparatus



2 Sheets-Sheet 1 C. HYLAND Filed Aug. 7

March 20, 1945.

HYDRAULIC REMOTE CONTROL APPARATUS s: Z, m l

March 20, `1945. u c. HYLAND `2,:*571893 HYDRAULIC REMOTE ,CONTROLAPPARATUS Filed Aug. '7,V 1942V 2 sheets-sheet l2 FIG. "2.

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` Chaz/zes Hyland Patented Mar; 20,v .1945

ACharles Hyland, Wakeeld, England, .assigner to Hyland Automobiles(England) Limited, Wake Application August 7, 1942, Serial No. 454,006In Great Britain May 23, i941 s claims, (ci. ca -54.5)

This invention relates to hydraulic 'remote control apparatus, the chiefobject being the provision of a hydraulic remote control whereby aplurality of predetermined movements at the remote or receiving end canbe obtained at the discretion of the operator at the control ortransmitting end. A further object is the provision of such a remotecontrol which will automatically provide at the control or transmittingend an indication that the receiver has operated in accordance with theactuation at the control or transmitting end.

According to the invention, the hydraulic conf I u trolapparatus-comprises essentially a hydraulic ram at the remote orreceiving end which is operatively connected to the'apparatus to beactuated and which is adapted in conjunction with ports in its cylinderto function as a valve, said ports being connected by pipe linescontrolled by a further or another remote valve whereby they can heselectively connected to the pressure side oil a hydraulic pump. closed,orl connected to the exhaust. The arrangement is such that not only canthe r be caused to make a complete full stroke in either direction, butalso it can be caused auxiliary cylinder, and the auxiliaryram or pistonmay co-operate. with these ports in the manner oi a valve to permit theadditional or excess fluid displaced bythe. main ram to pass through theauxiliary cylinder t0 exhaust by way of the control or selector valve.The indicator may comprise 'a pointer operated, either directly orthrough gearing, by the auxiliary ram or piston and working inlcommotion with a scale or dial which may be engraved according to theparticu lar purpose or apparatus to which the renote control is applied,whilstA they hydraulic system may also include a um pressure releasevalve, to control the maximum pressure in the ram cylinder, and a handoperated by-pass valve on the ram cylinder to enable the ram to be movedbyhand if required or in an emergency. say when the hydraulictransmission falls thrown any cause.

The remote' control apparatus may be duplicated or further multipliedaccording to the numto say, there y be a plurality of hydraulic l :i

to perform intermittent or partial strokes accord- A ins to thepredetermined tions of the cylinder ports, the length of the piston-likeportion of the ram, and the setting or .operation of the selectorl valvecontrolling the pipe lines to said ports.

Thus the remote control apmratus is adapted tol sive a plurality .ofdefinite movements at the remote end at the discretion of the operatorat' l searing to the apparatus or mech whichis under control.

The desired ndicaticn oi the correct operation ci the rain at the remoteend may be aiorded by an indicator associated with the selector valve atthe control end and actuated by an auxiliary hydraulic ram or pistonwhich is positively operated by and in accordance with the displacementof themain rain. In this connectionthe auxillary ram cylinder would beconnected in series with the main ram cylinder and would preferably havea slightly less displ zo, volume than the latter so as to ensure thatsaid auxiliary hydraulic ram or piston will always reach the f end of'its stroke before the main ram does so. The work.

ing uid displaced by the main ram in completing a iull stroke beyond thecapacity 'ofthe auxiliary ber of elements to be separately actuated,that is Eri; one foreach element to m actuated, each underv the'contrclof a separate selector valve, and all supplied `trorn ythe same pressurepump, and where' there are a plurality of selector valves these may beincorporated in a nel or valve chest at the control or t .':i tting endand to which the pressure side ofthe pump is connected. The hydraulicfluid or oil supply may be carried 'in a'tanlr at a sumcient head orelevation above' the ram or rams' and connected preferably through alter to the pump inlet, w rthe exhaust from the selector valve or valvesis re turned to'saidtank.:

In order that 'the invention may be clearly understood and readilycarried into effect, the same will now be more fully described withreference to and by the aid of the embodiments illustrated in the.accompanying drawings, wherein- Figure 1 is a diagrammatic view of thelay-out of a remote control apparatus constructed according to theinvention.

Figure 2' is a part sectional elevationof `the hydraulic ram at theremote or receiving end of 'thev apparatus. y

Figure. 3 vis a part sectional elevation of the indicator.- 4

Figure 4 is a similar 4view to Figure i showing the hydraulic ram at the'remote or receiving end in its right hand position.

cylinder would be by-passedto exhaustthrough one or -more appropriatenon-return valves which Figure 5 isa similar view .to Figure-4 showing vthe hydraulic ram at the remote or receiving end may be associated withports leadinginto the '55 in its intermediate position.Y

extends into the boiler furnace (also not shown),

andr the intermediate position at which nozzle rotation or oscillationcommences during the forward stroke, the ram I being connected (but notshown) to the blower nozzle by means of rack and pinion and step-upgearing to convert .the linear motion of the ram to rotary motionrequired for actuating the screw-operating gear of the blower nozzle.

The hydraulic fluid or oil is supplied to and -returned from the ramcylinder 2 by three pipes 3, 4, which connect it to a selector valve 6of the piston type, and having three positions corresponding to those ofthe ram I. The pipes 3 and 5connect to ports l, 8 at opposite ends ofthe Iram cylinder and the third pipe 4 connects to an intermediate port9 which is so located to ber 28 in the hollow valve member I4 and port8- oi' the ram, pipe 4 and port 32 of the valve 8 are connected toexhaust through the chamber 34 in the hollow valve member I4. At thesame time port 'I ,of the ram, pipe 3' and port 3l oi the selector valveare connected tothe pressure pipe I2 by way of ports 38 and 36 with theresult that the piston III oi the main ram I makes a complete stroke'tothe right hand end of the cylinder 2 into the position shown in Figure4..; In order to make the piston I0 of the ram I perform a partialstroke, the selector valve 6 is moved into the position shown in Figure5 ofthe drawcorrespond with the intermediate position of the K ram I,whilst the length of' the piston-like portion I0 oi' the ram I whichco-operates Withsaid intermediate port S in the' mannerof a valve ispredetermined in accordance with the partial stroke required foroscillating the blower nozzle.

The selector valve 8 has a hollow valve member I4 with an axial chamber28 open at the upper and lower ends within the selector valve 6.

Atr the lower end of the valve 6 is an annular port 29 open to theexhaust pipe I5 whilst a further annular port 30 connects to thepressure supply pipe I2. Further'ports 3l, 32, and 33 connect with thepipes 3, 4, and 5 respectively from the hydraulic ram cylinder 2 at theremote or receiving end. A through chamber 34'connects the axial chamber28 of the hollow valve member I4 so that ports 3| and 32 andconsequently pipes 3 and 4, may be connected through the chambers-33 and28 to the exhaust pipeA I5. A port is provided at the upper end of thehollow valve member I4 to enable the port' 33 in the selector valve 8and its pipe 5 to be conand valve 6, through pipe 5 to the port 8 oftheram at the remote or receiving end. Port 32 of the .valve 6 is closedwith the `result that the pipe 4 and its port 8 are also.closed. Port 3lis open to exhaust by way of the chambers 34 and 28 in the hollow valvemember I4 so that the pipe v3 and its port 'I in the ram cylinder 2 areat'exhaustl with the result that the piston I II of Y theram I is at theleft hand end of the cylinder 2.

By moving `the selector valve into the position shown in Figure 4 of thedrawings, port 8 of the ram, pipe B and port 33 ofthe valve 8 are con'-nected to exhaust through the port 35 and chamings wherein port 1 of theram, pipe 3 and port 3| are connected to exhaust as also lare port 9.-

pipe 4 and port 32. Port 8, pipe iandport- 33 are connected to thepressure pipe-I2 with the result that the piston I0 of the ram I movesto the left until it uncovers port 9 which is at exhai-lst and comes torest as shown in Figure 5 of the drawings.

A partial stroke of the ram I may only be made when the piston III ofthe ram is at the rear end of its cylinder 2 or the position shownperform a partial stroke which'will be determined" when said piston-likeportion I8 uncovers said intermediary port 3 and thereby releases thepressure from the cylinder 2. A partial ram stroke in a reversedirection may then be effected by adjusting the selector valve 6 so asto reverse the end ports 'I and 8 connections, whilst maintaining theintermediate [port 9 open to exhaust.

In this way the ram' may be caused y'to have a to-and-fro short strokeaction equal to the length 'nected to exhaust I5 when the hollow valvememindicator ram 'or piston '25 and causes it `to make of thepiston-like portion oi' the ram, in addition to `the full stroke actionwhen the intermediate port is closed and only the end ports areoperative, and such short action is imparted to the blower nozzle foreffecting the oscillating movement thereof. The 'lower end of the valveunit I4 has a port or passage 35' to the passage 28 and Dort 38.

p The indicator comprises an auxiliary cylinder 1 I8 which has aslightly less displacement volume than the main ram cylinder 2, and isconnected in series therewith -by being interposed in the pipe line 3leading from the selector valve 6 to the end port 'I of the maincylinder 2, whilst the connections I1 and I 8 to said auxiliarycylinderI8 have each associated therewith a by-pass port I9 and 28 respectively,each controlled by a nonreturn valve at 2I and 22. Each by-pass port I8and 28 leads into said cylinder at such a distance from the ends 23 and24 that it will be uncovered by the auxiliary ram or piston 25 when thelatter isV at that end. Thus when' the main ram I makes ajull stroke-inone direction oil is supplied to one end o1' themain cylinder 2 and, oil

displaced fromv the main cylinder operates the a complete stroke,theexcess oil displaced beyond the capacity of the auxiliary orindicator cylinder- I6 being passed through the latterby 'one of thevalvecontrclled by-pass ports I9 or 20 .to the selector valve 8 andthencejto the exhaust I5.

For a full main ram stroke -in thereverse direc' tion the pressure oilsuppliedl through "the selector valve 8 operates the auxiliary ram orpiston 25 to cause it to make a, full stroke and the oil displaced bythe auxiliary piston or ram is forced into the main cylinder 2 toactuate the main ram I, whilst when the auxiliary ram or piston 25 hasreached the end of its full stroke it has uncovered the other valvecontrolled by-pass port i9 or 20 so that pressure oil passes through theauxiliary cylinder i6 to the main cylinder 2 to complete the stroke ofthe main ram I.

When the main ram i is caused to make a partial stroke from the righthand end of the cylinder.2, the uid oil in said cylinder 2 forward ofthe piston i0 is displaced due to the movement of the said piston i0 andthe connecting of the pipe 3 to exhaust. The displaced fluid acts uponthe piston 25 of the indicator so that the latter is moved an amountcorresponding to the displacement which in turn is directlyproportionate to the movement of the piston l0 of the main ram and inthis manner the indicator shows that a partial stroke of the main ramhas taken place. Similarly when the main ram l is returned to the righthand end of the cylinder.

the pipe 3 as previously described is connected to the pressure supplywith the pipes l and 5 to exhaust and the moving pressure fluid throughthe pipe 3 acts upon the piston 25 of the indicator to operate thelatter and show that the piston I0 of the main ram I has'moved to theright hand end of its cylinder 2.

I claim:

l. Hydraulic remote control apparatus comprising a, cylinder arranged tobe operativelyconnected to the apparatus to be actuated, said cylinderhaving spaced inlet and outlet ports, a reciprocating ram in saidcylinder for controlling the ow of uid into and out of said ports, saidram being selectively movable to three predetermined positions, aselector valve for controlling the position of said ram. pipescommunicating the selector valve with said ports, said selector valvehavinga delivery passage communicating with a spaced exhaust passage,and valve means within the selector valve for controlling the iiow ofthe iluid therefrom into and out of the cylinder so as to actuate theram, means for operating said valve means, an auxiliary cylinderinterposed between the selector valve and the ram cylinder andcommunicating therewith'through one of said pipes so as tok bevconnected in series with the ram cylinder, an auxiliary piston withinthe auxiliary cylinder operable in accordance selectively movable tothree predetermined positions, a selector valve for controlling themovement of said ram, pipes communicating the selector valve with theram cylinder through said ports, valve means within said selector valvefor controlling the iiow of iluidvfrom the selector valve to the ramcylinder and the return flow oi' the iluid from the ram cylinder to theselector valve so as to actuate the ram, anauxiliary cylinder interposedbetween the selector valve and the ram cylinder and communicatingtherewith through one of said pipes leading from the selector valve toone of the end ports so as to, be connected in series with the ramcylinder` an auxiliary piston in the auxiliary cylinder operable inaccordance with the vdisplacement of the ram., the volume displaced bythe auxiliary cylinder being less than that of the ram cylinder, saidauxiliary cylinder having associated therewith spaced bypass ports, eachof said by-pass ports being controlled :by a non-return valve operableby movement of the auxiliary piston to remove excess iiuid from theauxiliary cylinder.

3. A hydraulic remote control apparatus comprising in combination aselector valve connectible to iluid pressure and exhaust, an indicatorand a. remote hydraulic ram,v end ports insaid remote hydraulic ram,pipes connecting said end ports to the selector valve, an intermediateport in said hydraulic ram, a pipe connecting said intermediate portwith the selector valve, and the indicator comprising a cylinder havingend ports connected in one of -said pipes connecting the end ports oftheremote hydraulic. ram with the selectorvalve, a piston within saidcylinder, and a piston rod operatively connecting the piston to saidindicator.

` CHART-.IB HYLAND.

